The UK's most complete GLP-1 guide
Every Question Answered. Every Side Effect Explained.
- How GLP-1 medications work
- Mounjaro vs Wegovy compared
- Injection instructions
- Side effects & solutions
- What to eat on treatment
- FAQs answered
Free tracker included with every download this week
What's a Healthy Weight According To Your Height in Kg?
Your healthy weight depends on your height, age, sex, and overall health — not just a single number. In the UK, we use BMI (body mass index) as the primary screening tool to determine whether a weight is healthy for a given height. The NHS defines a healthy BMI range as 18.5 to 24.9, though for adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower thresholds starting at BMI 18.5 to 22.9. This guide explains how to calculate your healthy weight range in kilograms and what factors matter most for your health.
10,000+ calculations today · NHS-aligned thresholds · 100% free
Calculate Your BMI Instantly
Enter your height and weight below. Supports both imperial (stone & lbs) and metric (kg). Results include NHS category, healthy weight range, and ethnicity adjustments.
What Is BMI and Why Does It Matter?
Body Mass Index (BMI) is the most widely used screening tool for assessing whether your weight falls within a healthy range. Used by the NHS, GPs, and weight management services across the UK, BMI provides a quick snapshot of your weight relative to your height. The formula is simple: your weight in kilograms divided by your height in metres squared (kg/m²).
While BMI isn't a perfect measure — it doesn't account for muscle mass, bone density, or fat distribution — it remains the standard first step in identifying potential weight-related health risks including type 2 diabetes, cardiovascular disease, high blood pressure, and certain cancers.
The NHS also recommends adjusted thresholds for people of South Asian, Chinese, or Black African heritage — a BMI of 23 or above is classified as overweight, and 27.5 as obese. Our calculator includes this adjustment as a one-click toggle.
How To Calculate Healthy Weight Range By Height in Kg
Your healthy weight range is calculated using a simple formula based on your height. To find your healthy weight range in kg, multiply your height in metres by itself, then multiply by 18.5 (lower bound) and 24.9 (upper bound).
Formula:
- Lower healthy weight = 18.5 × height(m)²
- Upper healthy weight = 24.9 × height(m)²
For example, at 1.75m tall, your healthy weight range would be approximately 56.6 kg to 76.2 kg (roughly 8st 12lbs to 12st). Use our free BMI calculator above to instantly calculate your personal healthy weight range — simply enter your height and the calculator will show you the NHS-recommended range for your height in both kg and stone. Remember that this range accounts for natural variation in body composition, muscle mass, and bone density.
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How It Works
Three simple steps to understand your weight and take action.
Enter your height and weight in our free calculator. Get your BMI, NHS category, healthy weight range, and ethnicity-adjusted thresholds instantly.
If your BMI suggests you're overweight or obese, explore our GLP-1 calculators to project potential weight loss on Mounjaro or Wegovy.
Use our progress tracker to log your weight weekly, visualise your journey with charts, and stay motivated — all stored privately in your browser.
Free Weight Loss Tools & Guides
Everything you need to understand your weight, explore medication options, and track your progress — completely free.
Important Factors Beyond Weight and Height
BMI is useful but has real limitations. It doesn't distinguish between muscle and fat, so athletes or very muscular individuals may have a higher BMI despite being healthy. Where you carry weight also matters — fat stored around your waist (particularly visceral fat) poses greater health risks than fat stored elsewhere.
The NHS also recommends checking waist circumference alongside BMI: men should aim for under 94cm (37in), women under 80cm (31.5in). Your individual health history, family genetics, age, and any weight-related conditions like type 2 diabetes or high blood pressure all influence what weight is healthiest for you personally. Always speak to your GP for personalised weight management advice.
- Dual GIP/GLP-1 receptor agonist
- Up to 22.5% body weight loss (SURMOUNT-1)
- Weekly injection, dose escalation over 20+ weeks
- Available via private prescription in the UK
- Doses: 2.5mg → 5mg → 7.5mg → 10mg → 12.5mg → 15mg
- GLP-1 receptor agonist
- Up to 15–17% body weight loss (STEP trials)
- Weekly injection, 5-step dose escalation
- NHS & private prescription available
- Doses: 0.25mg → 0.5mg → 1mg → 1.7mg → 2.4mg
Mounjaro vs Wegovy: Head-to-Head
A side-by-side comparison of the two most popular GLP-1 weight loss medications available in the UK.
| Feature | Mounjaro | Wegovy |
|---|---|---|
| Drug class | Dual GIP/GLP-1 agonist | GLP-1 agonist |
| Active ingredient | Tirzepatide | Semaglutide |
| Avg. weight loss | 15–22.5% | 12–17% |
| Key trial | SURMOUNT-1 (2022) | STEP 1 (2021) |
| Max dose | 15 mg weekly | 2.4 mg weekly |
| Escalation period | 20–32 weeks | 16–20 weeks |
| Administration | Weekly injection (pen) | Weekly injection (pen) |
| NHS availability | Private prescription only | NHS & private |
| Approx. private cost | £150–£250/month | £150–£300/month |
| Common side effects | Nausea, diarrhoea, constipation | Nausea, vomiting, diarrhoea |
Data sourced from SURMOUNT-1 and STEP 1 clinical trials. Costs are approximate and vary by provider. Always consult a prescriber.
Am I Eligible for Weight Loss Medication?
In the UK, eligibility for GLP-1 weight loss medications like Mounjaro and Wegovy is based on your BMI and overall health profile.
- BMI of 30 or above (obese)
- Age 18 or over
- No contraindicated conditions
- Committed to lifestyle changes
- BMI of 27 or above
- Plus type 2 diabetes
- Or high blood pressure
- Or obstructive sleep apnoea
Use our BMI calculator to check whether your BMI falls within the eligible range.
How We Built These Tools
Every calculator and guide on myweightcheck is built with accuracy and transparency in mind. Our BMI calculator uses the standard WHO formula with NHS-aligned category thresholds. Our GLP-1 projections are modelled on published clinical trial data from SURMOUNT and STEP studies.
All data stays on your device. We don't require sign-ups, and we don't store your health information on any server. Your progress tracker saves data locally in your browser using localStorage, so only you can see it.
We're based in the UK and our tools are designed specifically for UK users — supporting stone & lbs by default, referencing NHS guidelines, using NICE-approved medication data, and linking to GPhC-registered pharmacies.
Frequently Asked Questions
Common questions about BMI, weight loss medications, and our free UK tools.
What is the exact healthy weight for my height in kg?
There's no single "perfect" weight — healthy weight is a range based on BMI 18.5 to 24.9. Use our free BMI calculator above to find your personal range by entering your height and current weight. Your GP can also discuss what weight range is realistic and healthy for your individual circumstances.
Is BMI the best way to assess healthy weight?
BMI is a useful screening tool endorsed by the NHS, but it has limitations. It doesn't account for muscle mass, bone density, or where fat is stored. Waist circumference and overall health markers like blood pressure and blood sugar are also important. Discuss your weight health with your GP rather than relying on BMI alone.
Are healthy weight ranges different for men and women at the same height?
The BMI formula is the same for men and women — healthy BMI ranges are 18.5 to 24.9 for both. However, body composition (muscle vs fat ratio) naturally differs, and individual healthy weights vary based on factors like age, fitness level, and genetics. Your GP can advise on what's healthy for you specifically.
Does my ethnicity affect what a healthy weight is for my height?
Yes. The NHS recommends lower BMI thresholds for adults of South Asian, Chinese, Black African, and Black Caribbean heritage (18.5 to 22.9 rather than 18.5 to 24.9) because these groups face higher cardiovascular and type 2 diabetes risk at lower BMI levels. Discuss your personal healthy weight range with your GP, especially if this applies to you.
Can I use a weight converter to change my healthy weight range between kg and stone?
Absolutely. Our free weight converter on this page lets you instantly convert your healthy weight range from kg to stone and pounds, which many UK adults find easier to understand. Simply enter your range in kg and the converter will show the equivalent in stone and lbs.
Ready to take control of your weight loss journey?
Start with a free BMI check, explore your GLP-1 options, or begin tracking your progress today. No sign-up. No cost. Just results.